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# Corrosion behavior in Hank's solution of a magnesium-hydroxyapatite composite processed by high-pressure torsion

Lopes, D., Soares, Renata Braga, Castro, M., Figueiredo, R., Langdon, Terence G. and Lins, Vanessa F.C. (2020) Corrosion behavior in Hank's solution of a magnesium-hydroxyapatite composite processed by high-pressure torsion. Advanced Engineering Materials, 22 (12), [2000765].

Record type: Article

## Abstract

It is known that magnesium (Mg)-hydroxyapatite (HA) composites can be produced by the room temperature consolidation of particles. The present study analyzes the corrosion behavior of an Mg-HA composite and makes a direct comparison with pure Mg. Samples of Mg-HA and of pure Mg were immersed in Hanks solution for up to 60 hours and the microstructure and corrosion products were characterized by scanning and transmission electron microscopy and X-ray diffraction. Electrochemical tests were used to evaluate the corrosion behavior and a hydrogen evolution test was undertaken to determine the corrosion rate. The results show the corrosion rate of the Mg-HA composite is higher than for pure Mg but decreases significantly after ~10 hours of immersion in Hanks solution. The increase in corrosion resistance of the composite is attributed to the formation of a protective layer of corrosion products with an external surface layer rich in Ca, P and O.

Text

Accepted/In Press date: 22 July 2020
e-pub ahead of print date: 30 July 2020
Published date: 9 August 2020
Keywords: High-pressure torsion, hydroxyapatite, Magnesium, Metal matrix composite, Corrosion

## Identifiers

Local EPrints ID: 442750
URI: http://eprints.soton.ac.uk/id/eprint/442750
ISSN: 1438-1656
PURE UUID: ddbc2cbb-988a-48af-a073-a9f01c86824b
ORCID for Terence G. Langdon: orcid.org/0000-0003-3541-9250

## Catalogue record

Date deposited: 24 Jul 2020 16:45

## Contributors

Author: D. Lopes
Author: Renata Braga Soares
Author: M. Castro
Author: R. Figueiredo
Author: Vanessa F.C. Lins